BobH wrote on 10/20/20 at 20:45:30:


My understanding is the W prefix denotes a stainless steel bearing

Went to replace single row bearing with double row bearing and found this.  Hard to know if a scratch or crack, but will be checking further.  Anyone ever seen this?

Thanks, yes, I have an eBay one on order to have ready just in case.

Well it is probably me but I dont know what the photo is of
is it the new bearing? The old one ? the spacer?

Yes, Dave is correct.  #14 in the drawing.

I think that's the big MoFo on the front sprocket.
I'd favor the lower end of the torque range on the rear pulley nuts.

You should only need to take off the drive pulley if you need to get the belt off, or to change to a bigger pulley. ( 25 tooth Kaw. from Dave ) When you need to get it off, the best way is with a electric impact wrench. Just put it in first and hit it. To torque it down, you will need to lock-up the rear wheel, with the brake, or thru the wheel. ( tough on the spokes, but if you have changed to a cast wheel no problem )

BobH, glad you are on the road to recovery.  What did you find out about the crack?  Were you able to determine conclusively that the visual indication was indeed a crack, or was it a scratch?

Can you take a picture of the face of the pulley hub and post it?  If it's a crack, the linear indication should run down the face as shown in my markup circled in red.  It would be beneficial to us all if we knew more about your drive hub.